<?php
/**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2016/9/28 0028
 * Time: 下午 8:08
 */
header('Content-type:text/html;charset=utf-8');
$name = '小明';
$score = 78;
if(is_int($score)||is_float($score)){
    if($score >=90 && $score <=100){
        $str = 'A级';
    }elseif($score >=80 && $score <90){
        $str = 'B级';
    }elseif($score >=70 && $score <80){
        $str = 'C级';
    }elseif($score >=60 && $score <70){
        $str = 'D级';
    }elseif($score >=0 && $score <60){
        $str = 'E级';
    }
}else{
    $str = '输入的学生成绩不是数值！';
}
echo"<h2>学生成绩等级</h2><p>学生姓名：".$name."<p>学生分数：".$score."分<p>成绩等级：".$str;